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java/org/apache/jasper/compiler/JavacErrorDetail.java
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java/org/apache/jasper/compiler/JavacErrorDetail.java
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.jasper.compiler;
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import java.io.BufferedReader;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.util.ArrayList;
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import java.util.List;
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import org.apache.jasper.JspCompilationContext;
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import org.apache.tomcat.Jar;
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/**
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* Class providing details about a javac compilation error.
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*
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* @author Jan Luehe
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* @author Kin-man Chung
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*/
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public class JavacErrorDetail {
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private final String javaFileName;
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private final int javaLineNum;
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private String jspFileName;
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private int jspBeginLineNum;
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private final StringBuilder errMsg;
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private String jspExtract = null;
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/**
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* Constructor.
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*
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* @param javaFileName The name of the Java file in which the
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* compilation error occurred
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* @param javaLineNum The compilation error line number
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* @param errMsg The compilation error message
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*/
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public JavacErrorDetail(String javaFileName,
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int javaLineNum,
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StringBuilder errMsg) {
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this(javaFileName, javaLineNum, null, -1, errMsg, null);
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}
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/**
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* Constructor.
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*
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* @param javaFileName The name of the Java file in which the
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* compilation error occurred
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* @param javaLineNum The compilation error line number
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* @param jspFileName The name of the JSP file from which the Java source
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* file was generated
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* @param jspBeginLineNum The start line number of the JSP element
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* responsible for the compilation error
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* @param errMsg The compilation error message
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* @param ctxt The compilation context
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*/
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public JavacErrorDetail(String javaFileName,
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int javaLineNum,
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String jspFileName,
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int jspBeginLineNum,
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StringBuilder errMsg,
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JspCompilationContext ctxt) {
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this.javaFileName = javaFileName;
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this.javaLineNum = javaLineNum;
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this.errMsg = errMsg;
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this.jspFileName = jspFileName;
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// Note: this.jspBeginLineNum is set at the end of this method as it may
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// be modified (corrected) during the execution of this method
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if (jspBeginLineNum > 0 && ctxt != null) {
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InputStream is = null;
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try {
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Jar tagJar = ctxt.getTagFileJar();
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if (tagJar != null) {
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// Strip leading '/'
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String entryName = jspFileName.substring(1);
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is = tagJar.getInputStream(entryName);
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this.jspFileName = tagJar.getURL(entryName);
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} else {
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is = ctxt.getResourceAsStream(jspFileName);
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}
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// Read both files in, so we can inspect them
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String[] jspLines = readFile(is);
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try (FileInputStream fis = new FileInputStream(ctxt.getServletJavaFileName())) {
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String[] javaLines = readFile(fis);
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if (jspLines.length < jspBeginLineNum) {
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// Avoid ArrayIndexOutOfBoundsException
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// Probably bug 48498 but could be some other cause
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jspExtract = Localizer.getMessage("jsp.error.bug48498");
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return;
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}
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// If the line contains the opening of a multi-line scriptlet
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// block, then the JSP line number we got back is probably
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// faulty. Scan forward to match the java line...
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if (jspLines[jspBeginLineNum-1].lastIndexOf("<%") >
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jspLines[jspBeginLineNum-1].lastIndexOf("%>")) {
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String javaLine = javaLines[javaLineNum-1].trim();
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for (int i=jspBeginLineNum-1; i<jspLines.length; i++) {
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if (jspLines[i].indexOf(javaLine) != -1) {
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// Update jsp line number
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jspBeginLineNum = i+1;
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break;
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}
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}
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}
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// copy out a fragment of JSP to display to the user
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StringBuilder fragment = new StringBuilder(1024);
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int startIndex = Math.max(0, jspBeginLineNum-1-3);
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int endIndex = Math.min(
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jspLines.length-1, jspBeginLineNum-1+3);
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for (int i=startIndex;i<=endIndex; ++i) {
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fragment.append(i+1);
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fragment.append(": ");
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fragment.append(jspLines[i]);
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fragment.append(System.lineSeparator());
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}
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jspExtract = fragment.toString();
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}
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} catch (IOException ioe) {
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// Can't read files - ignore
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} finally {
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if (is != null) {
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try {
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is.close();
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} catch (IOException ignore) {
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// Ignore
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}
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}
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}
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}
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this.jspBeginLineNum = jspBeginLineNum;
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}
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/**
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* Gets the name of the Java source file in which the compilation error
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* occurred.
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*
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* @return Java source file name
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*/
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public String getJavaFileName() {
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return this.javaFileName;
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}
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/**
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* Gets the compilation error line number.
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*
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* @return Compilation error line number
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*/
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public int getJavaLineNumber() {
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return this.javaLineNum;
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}
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/**
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* Gets the name of the JSP file from which the Java source file was
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* generated.
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*
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* @return JSP file from which the Java source file was generated.
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*/
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public String getJspFileName() {
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return this.jspFileName;
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}
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/**
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* Gets the start line number (in the JSP file) of the JSP element
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* responsible for the compilation error.
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*
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* @return Start line number of the JSP element responsible for the
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* compilation error
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*/
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public int getJspBeginLineNumber() {
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return this.jspBeginLineNum;
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}
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/**
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* Gets the compilation error message.
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*
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* @return Compilation error message
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*/
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public String getErrorMessage() {
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return this.errMsg.toString();
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}
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/**
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* Gets the extract of the JSP that corresponds to this message.
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*
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* @return Extract of JSP where error occurred
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*/
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public String getJspExtract() {
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return this.jspExtract;
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}
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/**
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* Reads a text file from an input stream into a String[]. Used to read in
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* the JSP and generated Java file when generating error messages.
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*/
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private String[] readFile(InputStream s) throws IOException {
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BufferedReader reader = new BufferedReader(new InputStreamReader(s));
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List<String> lines = new ArrayList<>();
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String line;
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while ( (line = reader.readLine()) != null ) {
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lines.add(line);
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}
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return lines.toArray( new String[lines.size()] );
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}
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}
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